Barrett Business Services: Mawer reports 3.52% stake

Available on EDGAR 11/13/2026 - 02:56 PM EST Accepted by SEC EDGAR 11/13/2026 - 02:56 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Barrett Business Services Inc. (BBSI) is the issuer in an amended ownership disclosure reporting Mawer Investment Management Ltd.’s beneficial ownership of 853,874 common shares, or 3.52% of the class. Mawer reported sole voting and dispositive power over all 853,874 shares, with no shared power. The percentage calculation cites 24,235,180 BBSI common shares outstanding as of July 22, 2026.

Key Figures

Beneficial ownership: 853,874 shares Ownership percentage: 3.52% Shares outstanding: 24,235,180 shares

3 metrics

Beneficial ownership 853,874 shares Mawer Investment Management Ltd.'s amended ownership disclosure

Ownership percentage 3.52% Percentage of BBSI common stock

Shares outstanding 24,235,180 shares BBSI common shares outstanding as of July 22, 2026; cited as the percentage basis

Key Terms

beneficially owned, Sole Voting Power, Sole Dispositive Power, Ownership of 5 Percent or Less of a Class

4 terms

beneficially owned regulatory

"Amount beneficially owned: 853,874"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole Voting Power regulatory

"Sole Voting Power 853,874"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

Sole Dispositive Power regulatory

"Sole Dispositive Power 853,874"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Ownership of 5 Percent or Less of a Class regulatory

"Ownership of 5 percent or less of a class"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many BBSI shares did Mawer report owning?

Mawer Investment Management Ltd. reported beneficial ownership of 853,874 BBSI common shares, equal to 3.52% of the class.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 4)

BARRETT BUSINESS SERVICES INC

(Name of Issuer)

Common Stock

(Title of Class of Securities)

068463108

(CUSIP Number)

09/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 068463108

1

Names of Reporting Persons

Mawer Investment Management Ltd.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

ALBERTA, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 853,874.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 853,874.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

853,874.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

3.52 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: Based upon 24,235,180 Common Stock of Barrett Business Services, Inc. (the "Issuer") outstanding as of July 22, 2026, as reported in the Issuer's 10-Q filed with the Securities and Exchange Commission on August 6, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: BARRETT BUSINESS SERVICES INC
(b)	Address of issuer's principal executive offices: 8100 NE Parkway Drive, Suite 200, Vancouver, Washington 98662
Item 2.
(a)	Name of person filing: Mawer Investment Management Ltd.
(b)	Address or principal business office or, if none, residence: 600, 517 - 10th Avenue SW Calgary, Alberta, Canada T2R 0A8
(c)	Citizenship: Canada
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 068463108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 853,874
(b)	Percent of class: 3.52%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 853,874
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 853,874
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Mawer Investment Management Ltd.

Signature:	/s/ John Wilson
Name/Title:	Portfolio Manager
Date:	11/02/2026